The filterNot() function in Kotlin gets all the elements of the MutableList that don’t match the provided False.
inline fun <T> Iterable<T>.filterNot(
predicate: (T) -> Boolean
): List<T>
This method takes the predicate function as an argument.
This method returns a List object that contains all elements that don’t match the given predicate function.
The code below demonstrates how to use the filterNot() method in Kotlin:
fun main() {val list: List<Int> = mutableListOf(1, 2, 3, 4, 5)println("The list is : $list")val greaterThan3 = list.filterNot{ it > 3 }println("Elements which are not greater than3 $greaterThan3") // [1, 2, 3]val greaterThan0 = list.filterNot { it > 0 }println("Elements which are not greater than 0 : $greaterThan0") // [1, 2, 3]}
Line 3: We create a new MutableList object named list, using the mutableListOf() method. For the mutableListOf() method, we provide 1,2,3,4, and 5 as arguments. All the provided arguments are present in the returned list.
Line 6: We use the filterNot() method with a predicate function as an argument. This function returns False if the element is not greater than 3. The filterNot() method returns a list with elements for which the predicate function returns False. In this case, the predicate function returns False for the elements 1, 2, and 3. So, the filterNot() method returns [1,2,3] as the result.
Line 8: We use the filterNot() method with a predicate function as an argument. This function returns False if the element is not greater than 0. In this case, all elements are greater than 0. So, the filterNot() method returns an empty list [] as the result.